Clean up some LABS related code, remove un-used/needed stuff.

Adds actual working and feild tested wallet filter. Can set any amount 
of whitelist address's, in conf file or commandline args. 
fix daemon deadlock, when doing z_mergetoaddress and mining at same time 
(needs more testing on staking chains) 
Set z_mergtoaddress to use a 0 expiry height when not doing z-tx's. They 
were failing and peers were getting banned trying to broadcast them.

src/main.cpp

@@ -1270,9 +1270,6 @@ bool CheckTransaction(uint32_t tiptime,const CTransaction& tx, CValidationState
     }
 }
 
-extern char NOTARYADDRS[64][36];
-extern uint8_t NUM_NOTARIES;
-
 int32_t komodo_isnotaryvout(char *coinaddr) // from ac_private chains only
 {
     static int32_t didinit; static char notaryaddrs[sizeof(Notaries_elected1)/sizeof(*Notaries_elected1) + 1][64];